317786947 has 2 divisors, whose sum is σ = 317786948. Its totient is φ = 317786946.

The previous prime is 317786891. The next prime is 317786999. The reversal of 317786947 is 749687713.

It is an a-pointer prime, because the next prime (317786999) can be obtained adding 317786947 to its sum of digits (52).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317786947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 317786894 and 317786903.

It is not a weakly prime, because it can be changed into another prime (317786347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158893473 + 158893474.

It is an arithmetic number, because the mean of its divisors is an integer number (158893474).

Almost surely, 2^317786947 is an apocalyptic number.

317786947 is a deficient number, since it is larger than the sum of its proper divisors (1).

317786947 is an equidigital number, since it uses as much as digits as its factorization.

317786947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 52.

The square root of 317786947 is about 17826.5797897409. The cubic root of 317786947 is about 682.4099516685.

The spelling of 317786947 in words is "three hundred seventeen million, seven hundred eighty-six thousand, nine hundred forty-seven".